Steam-generator.



C. L. THUDIGHU-M.

- STEAM GENERATOR. APPLIOATION FILED OGT.24, 1907.

Patented Mar. 9, 1909.

2 SHEETS-SHEET 1.

G. L. THUDIGHUM.

STEAM GENERATOR. APPLICATION FILED 00124, 1907.

9 1 4: ,6 1 8 Patented Mar. 9, 1909.

2 SHEETS-:SHEET 2.

THE NORRIS PETERS co., wAsHmamN. a c.

rarnna CARL L. THUDIOHUM, OF ROLAND PARK, MARYLAND.

STEAM-GENERATOR.

Specification of Letters Patent.

Patented March 9, 1909.

Application filed October 24;, 1907. Serial No. 398,939.

To all whom it may concern:

Be it known that l, CARL L. Tnunronun, a citizen of the United States, residing at l loland Park, in the county of Baltimore and State of Maryland, have invented certain new and useful Improvements in Steam- Generators, of which the following is a specification.

This invention relates to boilers for generating steam for the propulsion of automobiles or other steam-propelled vehicles.

The object of the invention is the provision of an improved generator of the class ordinarily known as flash boilers which improvement I designate as a semi-flash generator, and one of the principal features of which is a permanent reservoir surrounding the boiler proper which serves as a surrounding water wall, as a feed-water heater and as a continuously available reserve supply of heated water for the boiler.

With this object in view my invention con sists in an improved steam generator comprising three principal parts to wit: Two eX- ternal series of coils which form the water wall or the feed-water heater, an inclosed structure of coiled pipes which I denominate the boiler proper, and a series of coiled pipes below the outer series of coils, which 1 denominate the super-heater.

In order that persons skilled in the art to which my invention appertains may be enabled to make and use the same, I will now proceed to describe the construction and operation thereof, in connection with the ac companying drawings in which- Figure 1 is a view showing the boiler proper and superheater in side elevation and the feed-water heater in section. Fig. 2 is a top plan view of the complete structure. Fig. 3, is a view in side elevation partly in section of the outer coil of the feed-water heater, detached. Fig. 4 is a top plan view thereof. Fig. 5, is a view in side elevation of the inner coil of the feed-water heater, detached. Fig. 6, is a top plan view thereof. Fig. 7, is a view in side elevation of the inner coiled pipe structure or boiler proper. Fig. 8, is a top plan view thereof.

teferring specifically to the drawings, 1 indicates the outer coil and 11 the inner coil of the feedwater heater shown detached in 'Figs. 3 to 6, the latter being located within the former as clearly shown inFig. 1, provision being made to connect these two series of coils at the bottom, their connecting ends being indicated at 12 and 13 in Figs. 3 and 5.

The water for feeding the boiler is entered at the top of the series of coils 10 at the point 14 and takes its course downwardly through this series of coils, passing out thereof at 12 and into the series of coils 11 at 13 (12 and 13 being connected together) from whence it takes its course upwardly through the series connected to a pipe 16 which forms the inlet of the boiler proper.

The boiler proper is illustrated detached in Figs. 7 and 8 and comprised of a series of convolute coils of any suitable nui'nher, the Water from the inner coil 1.1 of the feedwater heater entering the coil 18 of the boiler proper through pipe 17, said pipe extending to the middle of the convolute coil 18 as shown best in Figs. 7 and S whence the lluid takes its course through said coil outwardly until the outer turn is reached, a pipe 19 from said outer coil passing in a radial direction into the center of the next coil 20, taking same course therethrough and through all of the coils of this section until. at the point Jill of Fig. 7, the last radial pipe from an outer turn to an inner turn passes to the center of the bottom coil 22 and from thence the fluid passes upwardly through a vertical pipe or riser 21. which at takes a rad al direction to the center of a convolute coil 23 through which it passes to the outer oi 'n thereof and again inward at 24 to the center of another convolute coil 25, the last two coils forming a second section of the boiler proper. From the outer turn of this coil 25, a pipe or r' 26 leads upwardly and is bent radially at 27 from whence it leads downwardly at to the point 29, which is the entrance to the larger convolute coils 30, and which form the superheater, the fluid iassing from the point 29 outwardly through the coil St), to its outer turn, thence from the point 33 radially inward to the center of coil 31, thence outwardly through the said coil to the point 34 whence it passes radially into turn of said. coil 32, from which it passes through pipes 35 to the engine. it will readily be understood that these structures are necessarily inclosed in a suitable casing land inasmuch as the construction of the of coils 11 to the point 15, this point 15 being the center of coil 32 and thence to the outer casing forms no part of the resent invention it is not necessary to descri e or illustrate it herein.

The water entering and passin through the series of coils and 11 is thoroughly heated before being delivered as before described into the boiler proper, said coils therefore serving as a feed -water heater. Besides this the water contained in the feed- 10 water heater forms a permanent reserve supply, surrounding the boiler proper with a water wall, the escaping gases of combustion being not only thus utilized to heat the feed water but such utilization also serving to 15 reduce the temperature of said escaping gases to the lowest practical point and thus protect the casing from the heat of the fire. This reservoir of reserve water is always full and at its delivery point is always at a boiling temperature. This boiling water, as soon as it asses into the highly heated pipes to the bo' er proper, will immediately flash into steam and as it is more highly heated in passing through each coil of the boiler proper, it will become thoroughly superheated steam of extremely high pressure and temperature after passing through the superheater coils. The upper coils of the second section of the boiler proper above the coil 18 act as a steam drum or compression chamber and hold the water back in the coils of the boiler allowing nothing but steam to escape from the outlet. The boiler and superheater are made of the same diameter as the burner by which they are superheated and the superheater comes into immediate contact with the flame thereof, said flame next contacting with the coils of the boiler proper, thus insuring the heating of the superheater and boiler to the very highest degree so that the steam will be thoroughly superheated and raised to the highest temperature.

What I claim as new is:

1. A steam generator comprising, in combination, a feed water heater com rising a spiral coil of pi c with an inlet at t e lower end and an out et at the u per end thereof, a boiler proper located wit in the feed water heater and comprising a plurality of convolute coils and radial connections between the outer coil of each convolute and the inner coil of the next convolute below it, the inlet being in the inner coil of the up er convolute, and a vertical and horizonta pipe leading from the outlet of the feed water heater to the inlet of the boiler proper.

2. A steam generator including, in combination, a boiler proper comprising a section which comprises a plurality of convolute 6O coils of pipe one above the other, with radial pipes directly connecting the outside of each coil with the center of the adjacent lower coil, a feed water heater com rising outer spiral coils surrounding the boiler proper, a

vertical horizontal connecting pipe leading from the top of the feed water heater to a coil near the top of the boiler, and a suitable outlet pipe leading from the bottom coil of the boiler to above the top coil thereof.

3. A steam generator comprising, in combination, a boiler proper which includes two superposed sections, each section comprising a plurality of convolute coils, a water inlet pipe leading from above the upper section'to the inner coil of the uppermost convolute of the lower section, a connecting pipe leading from the outermost coil of lowest convolute of the lower section to the innermost coil of the up er convolute of the upper section, and an out et pipe leading from the outer coil of the lowest convolute of the upper section to a point above said upper section.

4. A steam generator comprising in combination, a boiler including a series of convolute coils arranged one above the other with connections from the outside of each coil to the center of the next adjacent lower coil directly, and a water-wall forming a feedwater heater surrounding the boiler proper, comprising an outer spiral coil with an inlet for water at its upper end, a second spiral coil inside the first and connected thereto at the bottom, and a connection vertical and horizontal from the top of said second coil to the center of the upper convolute coil of the boiler proper. V r

5. A steam generator comprising, in combination, a section which includes a plurality of convolute coils arranged one above the other with connections from the outside of each coil to the center of the next adjacent lower coil, an inlet for water tothe center of the upper coil and an outlet from the outside of the bottom coil, a second section comprising a plurality of similar coils superposed above each other and above the first section,

a pipe connecting the outlet of the first section with the center of the upper coil of the second section, and an outlet pipe leading from the outside of the lower coil of the sec- 0nd section upwardly to a point above the upper coil thereof. a

6. A steam generator comprising in combination a feed-water heater which includes a spiral coil with inlet for water, an outlet for the same at the top, a boiler proper comprising a plurality of superposed convolute coils within the feed-water heater, connections from the outlet of the feed-water heater to the boiler proper, a superheater comprising a series of superposed convolute coils below the boiler proper and the feed-water heater, connections between the top ofthe boiler proper and the center of the top coil of the superheater, and connections between the outside of each coil of the superheater, and the center of the next adjacent lower coil.

7. A steam generator comprising, in combination, spiral coil with an inlet for water at the top thereof, a second spiral coil inside the first and connected at its bottom with the bottom thereof, a section within the second coil comprising a superposed series of convolute coils, radial pipes connecting the center of each coil with the outside of the next adjacent lower coil, a pipe leading from the upper end of the second spiral coil to the upper coil of the inner section, a second inner section comprising a series of convolute coils superposed above the first section and connected from the center to the outside of adj acent coils, a connection between the lower coil of the first inner section and the upper coil of the second inner section, a superheater comprising a series of superposed convolute coils below the feed-water heater and inner sections, an outlet for steam from the lower coil of the superheater, and a connection between the lower coil of the second inner section and the upper coil of the superheater.

In testimony whereof I aliix my signature in presence of two Witnesses.

- CARL L. THUDIOHUM.

Witnesses:

M. H. PLUNKETT,

ELIZABETH A. PARKER. 

